• 한국컴퓨터정보학회논문지
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• 제13권4호
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• pp.19-30
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• 2008

분기 히스토리는 분기 예측기의 주된 입력 요소로 사용된다. 따라서 적절한 분기 히스토리의 사용은 분기 예측의 정확도 향상에 큰 영향을 미친다. 본 논문에서는 분기 예측의 정확도를 향상시키기 위한 방법의 하나로, 명령어의 연관성 분석을 통한 선별적 분기 히스토리 사용 기법을 제안한다. 우선, 본 논문에서는 명령어의 연관성을 분석하는 세 가지 서로 다른 알고리즘을 제안한다. 제안된 기법은 명령어의 레지스터 쓰기 연산에 기반하는 방법, 분기 명령어의 참조 레지스터에 기반하는 방법, 그리고 이들 두 가지 방식을 상호 결합하는 방법이다. 또한, 제안된 세 가지 알고리즘의 실질적 구현을 위해 이를 적용할 수 있는 가변 입력 gshare 예측기를 제안한다. 본 논문에서는 모의실험을 통해 세 가지 알고리즘의 특징 및 장단점을 비교 분석한다. 특히, 기존의 고정된 입력을 사용하는 방식과 비교하여 제안된 기법의 성능 향상의 정도를 분석하며, 사전 프로파일링을 통해 얻어진 최적의 입력에 대한 성능상의 차이도 소개한다.

• Human Ecology Research
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• 제58권4호
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• pp.539-560
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• 2020

This study presents work-family multiple-role planning by female university students as a new approach to worklife balance. Accordingly, this study examines university years as a key time frame during which students establish their career paths. This study integrates the social cognitive career theory and the planned behavior theory to design and evaluate a model that explains the work-family multiple-role planning process; in addition, it develops an optimal model to predict the intentions of female university students in work-family multiple-role planning. This study has conducted a structural survey with 500 female university students. After inspecting the data, the responses of 435 participants were used in the data analysis (SEM) with SPSS 21.0 and AMOS 21.0. The findings include the following. First, suitability of predictive model presents a satisfying fit. The major factors in this study's model (parental support, subjective norms, attitudes toward multiple-role planning, career decision self-efficacy, and outcome expectations) are verified as direct and indirect predictors of the work-family multiple-role planning intent of female university students. Second, the strongest predictive factor for the work-family multiple-role planning intent is the social environment factor (subjective norms), indicating that the influence of social pressure on intent is relatively large. The predictive model formulated under this study's integrated theoretical framework supplements existing research that focused on attitudes toward multiple-role planning as well as provides a more profound theoretical foundation on which work-family multiple-role planning behaviors can be better understood.

• Clinical and Experimental Reproductive Medicine
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• 제48권3호
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• pp.255-261
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• 2021

Objective: This study aimed to investigate sperm motility and its changes after preparation as predictors of pregnancy in intrauterine insemination (IUI) cycles. Methods: In total, 297 IUI cycles from January 2012 to December 2017 at a single tertiary hospital were retrospectively analyzed. Patient and cycle characteristics, and sperm motility characteristics before and after processing were compared according to clinical pregnancy or live birth as outcomes. Results: The overall clinical pregnancy rate per cycle was 14.5% (43/297) and the live birth rate was 10.4% (30/289). Patient and cycle characteristics were similar between pregnant and non-pregnant groups. Sperm motility after preparation and the total motile sperm count before and after processing were comparable in terms of pregnancy outcomes. Pre-preparation sperm motility was significantly higher in groups with clinical pregnancy and live birth than in cycles not resulting in pregnancy (71.4%±10.9% vs. 67.2%±11.7%, p=0.020 and 71.6% ±12.6% vs. 67.3%±11.7%, p=0.030, respectively). The change in sperm motility after processing was significantly fewer in the non-pregnant cycles, both when the comparison was conducted by subtraction (post-pre) and division (post/pre). These relationships remained significant after adjusting for the female partner's age, anti-Müllerian hormone level, and number of pre-ovulatory follicles. According to a receiver operating characteristic curve analysis, an initial sperm motility of ≥72.5% was the optimal threshold value for predicting live birth after IUI. Conclusion: Initial sperm motility, rather than the motility of processed sperm or the degree of change after preparation, predicted live birth after IUI procedures.

• 대한암한의학회지
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• 제26권1호
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• pp.17-27
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• 2021

Objective: This study aimed to evaluate which information of cancer patients should be collected for the Korean medicine cancer registry in order to assess the efficacy and safety of Korean medicine (KM) treatment and to identify Korean medical prognostic predictors. Methods: A total of fifteen Korean medical specialists completed an online survey questionnaire including items about general characteristics of cancer patients and clinical practice patterns. Results: The four main types of cancer at Korean medical hospitals were breast, lung, stomach, and colorectal cancer. The majority of patients with cancer at Korean medical hospitals were in the advanced or metastatic stage (50.0%). The prominent purposes of KM treatment were to alleviate cancer-related symptoms, reduce the side effects of conventional therapy, and improve quality of life. The major options for treatment were traditional herbal medicine (THM), acupuncture, moxibustion, thermotherapy, pharmacoacupuncture, and meditation, with THM being the most frequently used (35.7%). Almost all Korean medical specialists (93.9%) used syndrome differentiation in clinical practice and identified over half the cancer patients as deficiency syndrome (57.2%). Conclusion: Physicians considered the primary goal of KM treatment for cancer patients to be symptom management since advanced or metastatic stage patients were the majority at Korean medical hospitals. THM were the most common treatment option and syndrome differentiation was used by almost all physicians. Further research is needed to monitor and ensure optimal KM treatment for patients with cancer.

• 대한통합의학회지
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• 제10권3호
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• pp.107-117
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• 2022

Purpose : The purpose of this study was to establish a model of the predictive factors for success or failure of examinees undertaking the Korean physical therapist licensing examination (KPTLE). Additionally, we assessed the pass/fail cut-off point. Methods : We analyzed the results of 10,881 examinees who undertook the KPTLE, using data provided by the Korea Health Personnel Licensing Examination Institute. The target variable was the test result (pass or fail), and the input variables were: sex, age, test subject, and total score. Frequency analysis, chi-square test, descriptive statistics, independent t-test, correlation analysis, binary logistic regression, and receiver operating characteristic (ROC) curve analyses were performed on the data. Results : Sex and age were not significant predictors of attaining a pass (p>.05). The test subjects with the highest probability of passing were, in order, medical regulation (MR) (Odds ratio (OR)=2.91, p<.001), foundations of physical therapy (FPT) (OR=2.86, p<.001), diagnosis and evaluation for physical therapy (DEPT) (OR=2.74, p<.001), physical therapy intervention (PTI) (OR=2.66, p<.001), and practical examination (PE) (OR=1.24, p<.001). The cut-off points for each subject were: FPT, 32.50; DEPT, 29.50; PTI, 44.50; MR, 14.50; and PE, 50.50. The total score (TS) was 164.50. The sensitivity, specificity, and the classification accuracy of the prediction model was 99 %, 98 %, and 99 %, respectively, indicating high accuracy. Area under the curve (AUC) values for each subject were: FPT, .958; DEPT, .968; PTI, .984; MR, .885; PE, .962; and TS, .998, indicating a high degree of fit. Conclusion : In our study, the predictive factors for passing KPTLE were identified, and the optimal cut-off point was calculated for each subject. Logistic regression was adequate to explain the predictive model. These results will provide universities and examinees with useful information for predicting their success or failure in the KPTLE.

• Journal of Korean Neurosurgical Society
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• 제65권3호
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• pp.415-421
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• 2022

Objective : Seizure recurrence after the first-ever seizure in patients with a supratentorial cerebral cavernous malformation (CCM) is almost certain, so the diagnosis and treatment of epilepsy is justified. The optimal method of management of these patients is still a matter of debate. The aim of our study was to identify factors associated with postoperative seizure control and assess the surgical morbidity rate. Methods : We retrospectively analysed 45 consecutive patients with a supratentorial CCM and symptomatic epilepsy in a single centre. Pre- and postoperative epidemiological data, seizure-related patient histories, neuroimaging results, surgery details and outcomes were obtained from hospital medical records. Seizure outcomes were assessed at least 12 months after surgery. Results : Thirty-five patients (77.8%) were seizure free at the long-term follow-up (Engel class I); six (13,3%) had rare, nocturnal seizures (Engel class II); and four (8.9%) showed meaningful improvement (Engel class III). In 15 patients (33%) in the Engel I group; it was possible to discontinue antiepileptic medication. Although there was not statistical significance, our results suggest that patients can benefit from early surgery. No deaths occurred in our study, and mild postoperative neurologic deficits were observed in two patients (4%) at the long-term follow-up. Conclusion : Surgical resection of CCMs should be considered in all patients with a supratentorial malformation and epilepsy due to the favourable surgical results in terms of the epileptic seizure control rate and low postoperative morbidity risk, despite the use of different predictors for the seizure outcome.

• Journal of Cardiovascular Imaging
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• 제31권4호
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• pp.200-206
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• 2023

BACKGROUND: Right ventricular (RV) dysfunction is a significant risk of major adverse cardiac events in patients with acute heart failure (AHF). In this study, we evaluated RV-pulmonary artery (PA) coupling, assessed by tricuspid annular plane systolic excursion (TAPSE)/pulmonary artery systolic pressure (PASP) and assessed its prognostic significance, in AHF patients. METHODS: We measured the TAPSE/PASP ratio and analyzed its correlations with other echocardiographic parameters. Additionally, we assessed its prognostic role in AHF patients. RESULTS: A total of 1147 patients were included in the analysis (575 men, aged 70.81 ± 13.56 years). TAPSE/PASP ratio exhibited significant correlations with left ventricular (LV) ejection fraction(r = 0.243, p < 0.001), left atrial (LA) diameter(r = -0.320, p < 0.001), left atrial global longitudinal strain (LAGLS, r = 0.496, p < 0.001), mitral E/E' ratio(r = -0.337, p < 0.001), and right ventricular fractional area change (RVFAC, r = 0.496, p < 0.001). During the median follow-up duration of 29.0 months, a total of 387 patients (33.7%) died. In the univariate analysis, PASP, TAPSE, and TAPSE/PASP ratio were significant predictors of mortality. After the multivariate analysis, TAPSE/PASP ratio remained a statistically significant parameter for all-cause mortality (hazard ratio [HR], 0.453; p = 0.037) after adjusting for other parameters. In the receiver operating curve analysis, the optimal cut-off level of TAPSE/PASP ratio for predicting mortality was 0.33 (area under the curve = 0.576, p < 0.001), with a sensitivity of 65% and a specificity of 47%. TAPSE/PASP ratio < 0.33 was associated with an increased risk of mortality after adjusting for other variables (HR, 1.306; p = 0.025). CONCLUSIONS: In AHF patients, TAPSE/PASP ratio demonstrated significant associations with RVFAC, LA diameter and LAGLS. Moreover, a decreased TAPSE/PASP ratio < 0.33 was identified as a poor prognostic factor for mortality.

• 한국항해항만학회지
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• 제41권3호
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• pp.137-148
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• 2017

항만의 서비스 수준은 항만의 운영 및 관리 주체인 터미널운영사(TOC), 항만공사 및 정부의 입장에서 항만간 경쟁력의 기준이 되며, 항만의 이용 주체인 선사 및 화주의 입장에서는 어느 항만을 선택할 지를 결정하는 중요 지표로도 활용된다. 이러한 지표의 중요성을 고려하여 컨테이너 부두 및 벌크부두를 대상으로 중요 서비스 지표인 선석 점유율, 선박 대기율, 선석 처리량, 접안 척수, 평균 대기 척수, 평균 대기 시간과 같은 6개 지표를 객관적으로 정의하고 관리할 수 있는 소프트웨어를 개발하였다. 컨테이너 부두는 1개 선석부터 6개 선석까지와 벌크 부두는 1개 선석부터 4개 선석까지를 선택적으로 활용할 수 있도록 6개의 서비스 지표를 산정하여 예측이 가능토록 하였다. 이를 활용하면 선석점유율 대비 선박 대기율, 선석 처리량, 접안 척수, 평균 대기 척수, 평균 대기 시간을 예측할 수 있다. 추가하여 선박의 도착 패턴에 따라 선박 대기율과 항만의 생산성 지표인 연간 처리량도 어떻게 변화되는지를 예측할 수 있도록 하였다. 결과적으로, TOC 입장에서는 서비스 지표인 선박 대기율과 생산성 지표인 연간 처리량의 관계에서 최적의 운영 수준을 전략적으로 선택(Trade-off)할 수 있으므로 경쟁 항만에 대비하여 더 많은 선사 및 화주를 유치할 수 있으므로 터미널 수입도 극대화할 수 있다.

• Clinical and Experimental Pediatrics
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• 제52권9호
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• pp.1021-1028
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• 2009

목 적:저자들은 그레이브스병으로 인한 갑상샘기능항진증을 가진 소아나 청소년에게 항갑상샘 약물 치료 전, 치료 중, 그리고 치료 종료 시에 관해를 예측할 수 있는 예측인자를 각각 찾아보고 그레이브스병의 관해율을 알아보고자 하였다. 방 법:그레이브스병으로 인한 갑상샘기능항진증으로 진단받고 3년 이상 외래 추적 관찰이 가능했던 64명의 환자를 관해를 획득한 군과 관해를 획득하지 못한 군으로 나누어 후향적으로 진단 당시의 갑상선 기능 검사와 TBII, 진단 당시 Tanner stage, 갑상샘 질환 가족력, 발현시의 증상, TBII가 정상화되는 시기와 TRH 자극 검사 시행 여부 등을 조사 분석하였다. 결 과:총 64명의 환아 중 관해가 온 환아는 37명(57.8%), 마지막 외래 추적 관찰 때 까지 관해가 오지 않은 환아는 27명(42.2%)이었다. 관해를 획득한 군과 관해를 획득하지 못한 군에서 성별이나, 발병 당시 나이, 안구돌출 여부나 진단 당시 갑상샘종의 크기, 갑상샘 질환의 가족력, 그리고 진단 당시 갑상샘 기능 검사나 TBII 수치도 차이가 없었다. 약물 치료 후 TBII가 정상화되기까지 걸리는 기간은 관해를 획득한 군은 평균 $15.5{\pm}12.07$개월, 관해를 획득하지 못한 군은 $41.69{\pm}35.70$개월로 관해를 획득한 군에서 관해를 획득하지 못한 군에 비해 유의하게 짧았다(P<0.05). 관해에 도달 한 후 TRH 자극 검사를 시행한 28명의 환아 중 정상 또는 과도한 반응을 보인 26명 중 24명(92.8%)은 마지막 외래 추적 관찰 시까지 관해를 유지하고 있었고 오직 2명(7.7%)에서만 재발하였다. 로지스틱 회귀 분석을 통해 약물 치료 후 TBII가 빨리 정상화 되는 경우 관해가 올 가능성이 높음을 알 수 있었다. 그리고 본 연구에서의 관해율은 3년에 6.3%, 6년에 55.8%로 나타났다. 결 론:치료 중 TBII가 빨리 정상화되는 것은 소아 및 청소년 그레이브스병 환자의 관해여부를 예측할 수 있는 인자가 될 수 있을 것으로 생각되며 약물 중단 시에는 TRH 자극 검사가 그레이브스병이 재발 없이 관해를 유지할 수 있는지 예측 하는데 도움을 줄 수 있을 것으로 생각된다.

• 한국콘텐츠학회논문지
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• 제13권12호
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• pp.829-839
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• 2013

본 연구는 로지스틱 회귀분석과 의사결정나무 분석을 활용하여 일 대도시 주민의 우울에 영향을 주는 요인을 예측하고 비교하고자 시도된 서술적 조사연구이다. 연구대상은 20세에서 65세 미만의 일 대도시 주민 462명이었다. 자료 수집은 2011년 10월 7일부터 10월 21일까지이었으며, 자료 분석은 SPSS 18.0 프로그램을 이용하여 빈도, 백분율, 평균과 표준편차 및 ${\chi}^2$-test, t-test, 로지스틱 회귀분석, roc curve, 의사결정나무 분석으로 분석하였다. 본 연구 결과, 로지스틱 회귀분석과 의사결정나무 분석에서 공통적으로 나타난 우울 예측요인은 사회부적응, 주관적 신체증상 및 가족 지지이었다. 로지스틱 회귀분석에서 특이도 93.8%, 민감도 42.5%이었고, 본 연구의 모형 적합도를 roc curve 검증 한 결과 AUC=.84으로 본 연구 모형은 적합(p=<.001)하다고 할 수 있다. 우울예측에 대한 의사결정나무 분석은 분류에 대한 예측 정확도에서 특이도 98.3%, 민감도 20.8%이었고, 전체 분류 정확도는 로지스틱 회귀분석은 82.0%, 의사결정나무 분석은 80.5% 이었다. 본 연구 결과 민감성과 분류 정확도와 더 높게 나타난 로지스틱 회귀분석 방법이 지역 주민의 우울 예측 모형을 구축하는데 더 유용한 자료로 사용될 수 있으리라 사료된다.